package string;

public class StringBuilderDemo {
    public static void main(String[] args) {
        String str = "好好学习Java";
        StringBuilder builder = new StringBuilder(str);
        builder.append(",为了找个好工作");//追加
        System.out.println(builder);
        builder.replace(9,16,"就是为了改变世界");//替换(含头不含尾)
        System.out.println(builder);
        builder.delete(0,8);//删除
        System.out.println(builder);
        builder.insert(0,"活着");//插入内容
        System.out.println(builder);









//        //创建方式
//         StringBuilder builder1 = new StringBuilder();
//         StringBuilder builder2 = new StringBuilder("abc");
//
//         //String和StringBuilder转换
//         String str = "abc";
//         StringBuilder builder3 = new StringBuilder(str);
//         String str2 = builder3.toString();
    }
}
